#include <iostream>
#include <vector>

using namespace std;
vector<int> A, B, C;


void deduct_0 (vector<int> &k){
    while(k.size() > 1 && k.back() == 0) k.pop_back();
    return;
}

vector<int> add (vector<int> a, vector<int> b){
    vector<int> c;
    int tmp = 0;
    for(int i = 0; i < a.size() || i < b.size(); i ++){
        if (i < a.size()) tmp += a[i];
        if (i < b.size()) tmp += b[i];
        c.push_back(tmp % 16);
        tmp = 0;
    }
    return c;
}

int main() {
    string a, b;
    while (cin >> a >> b) {
        for (int i = a.size() - 1; i >= 0; i --) {
            if (a[i] >= '0' && a[i] <= '9')
                A.push_back(a[i] - '0');
            else 
                A.push_back(a[i] - 'A' + 10);
        }

        deduct_0 (A);

        for (int i = b.size() - 1; i >= 0; i --) {
            if (b[i] >= '0' && b[i] <= '9')
                B.push_back(b[i] - '0');
            else 
                B.push_back(b[i] - 'A' + 10);
        }

        deduct_0 (B);

        C = add (A, B);

        for(int i = C.size() - 1; i >= 0; i --){
            if (C[i] >= 10 && C[i] <= 15)
                printf("%c", C[i] - 10 + 'A');
            else
                printf("%d", C[i]);
        }
        cout << endl;
        A.clear ();
        B.clear ();
        C.clear ();

    }
    return 0;
}